253563021 has 8 divisors (see below), whose sum is σ = 375648960. Its totient is φ = 169041996.

The previous prime is 253563001. The next prime is 253563049. The reversal of 253563021 is 120365352.

253563021 is a `hidden beast` number, since 2 + 5 + 3 + 5 + 630 + 21 = 666.

It is not a de Polignac number, because 253563021 - 2⁵ = 253562989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9391223 = 253563021 / (2 + 5 + 3 + 5 + 6 + 3 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253563001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4695585 + ... + 4695638.

It is an arithmetic number, because the mean of its divisors is an integer number (46956120).

Almost surely, 2^253563021 is an apocalyptic number.

It is an amenable number.

253563021 is a deficient number, since it is larger than the sum of its proper divisors (122085939).

253563021 is an equidigital number, since it uses as much as digits as its factorization.

253563021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9391232 (or 9391226 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 253563021 is about 15923.6622986046. The cubic root of 253563021 is about 632.9391689258.

It can be divided in two parts, 2535 and 63021, that added together give a palindrome (65556).

The spelling of 253563021 in words is "two hundred fifty-three million, five hundred sixty-three thousand, twenty-one".